20 MPG combined. That’s the headline figure for the 2015 Mercedes-Benz ML400 4Matic, and while it might not seem like a standout number, it reflects this vehicle’s blend of performance, luxury, and capability. The ML400 appeals to buyers prioritizing a refined driving experience, a potent engine, and the reassurance of all-wheel drive, even if it means accepting mid-pack fuel efficiency.

City and highway performance

The EPA estimates the ML400 4Matic achieves 18 MPG in the city and 22 MPG on the highway. These figures are directly tied to the spirited 3.0L turbocharged V6 engine under the hood, an engine prioritizing smooth acceleration and ample power. The seven-speed automatic transmission contributes to overall efficiency and is programmed for responsive shifts. Drivers who prioritize brisk acceleration and confident merging will likely see numbers closer to the EPA estimates. A more conservative driver focused on maintaining consistent speed might squeeze out a bit more, particularly on longer highway journeys.

Annual fuel cost

The EPA’s estimated annual fuel cost for the 2015 Mercedes-Benz ML400 4Matic is exactly $2,900. This figure is based on driving 15,000 miles per year and using the EPA’s estimated combined fuel economy figure (20 MPG) in conjunction with the national average fuel price. Remember that your actual fuel costs may vary based on your driving habits, the type of fuel you purchase, and changes in gasoline prices.

Real-world expectations

While the EPA provides a standardized benchmark, real-world fuel economy often changes. Factors like driving style, traffic conditions, and terrain can significantly impact fuel consumption. Owners who frequently engage the ML400’s sporty driving modes or spend a lot of time in stop-and-go traffic will likely see MPG figures below the EPA’s 20 MPG combined rating. Drivers who adopt a gentler driving style and prioritize highway miles may experience results closer to, or even slightly above, the 22 MPG highway estimate. Checking resources for all Mercedes Benz fuel economy data is a good way to get an idea of what to expect.

How it compares

The ML400 4Matic exists in a competitive segment. The 2015 BMW X5 xDrive35i, for example, achieves a slightly better 22 MPG combined with its turbocharged inline-six, but lacks some of the ML400’s luxurious interior appointments. The Acura MDX SH-AWD offers 21 MPG combined and appeals to a more value-conscious buyer, but it does so with a less potent engine and a less prestigious badge. Even considering ML400 MPG across all years, you’ll find that fuel efficiency hasn’t varied much. The Lexus RX 350 mirrors the ML400’s 20 MPG combined rating and is typically favored for its reliability, presenting a different compromise between luxury and fuel consumption. These comparisons highlight the trade-offs made to achieve the specific blend of performance, luxury, and all-weather capability that this SUV provides.

Tips to maximize efficiency

Take advantage of the ML400’s Eco driving mode. This setting adjusts throttle response and transmission mapping to prioritize fuel efficiency without drastically sacrificing performance. It’s a subtle adjustment that can make a difference, especially in city driving.

Ensure your tires are properly inflated. Underinflated tires increase rolling resistance, leading to decreased fuel economy. Regularly check your tire pressure and maintain the recommended inflation level specified on the sticker inside the driver’s side door jamb. This is important given the ML400’s weight.

Avoid aggressive acceleration and braking. The ML400’s strong engine can be tempting to unleash, but rapid acceleration and hard braking reduce fuel economy. Anticipate traffic flow and strive for smooth, gradual transitions. Leave some additional space in front to maintain a steady speed.

Minimize idling. If you anticipate being stopped for more than a minute or two, turn off the engine. Excessive idling consumes fuel without covering any distance. Restarting the engine consumes less fuel than letting it idle unnecessarily.

Reduce aerodynamic drag. Remove any unnecessary items from the roof rack or cargo carrier. These accessories increase aerodynamic drag, forcing the engine to work harder and consume more fuel, especially at highway speeds. Luxury SUV owners often forget this.